There is a new Korean “Unicorn” (a company valued at US$1 billion): Yello Mobile. Founded in August 2012, Yello Mobile is a company that bought 61 mobile companies just last year in Korea. This might make you wonder if it’s really a startup. Yes and no. The company has became huge, with 74 companies in its portfolio, but it tries to retain the startup culture and managing style and prevent having a centralized culture among its divisions to avoid the bureaucracy endemic to large companies.